Why can't sludge resources be utilized without sludge drying equipment

Compared with landfill disposal and sludge incineration, sludge resource utilization is more suitable for the development trend of sludge treatment and disposal. In this regard, both at home and abroad have been more successful cases. However, in addition to policy support, sludge recycling also needs technical conditions, such as sludge drying and dewatering technology - using sludge drying equipment to reduce the moisture content of high wet and high viscosity sludge, the dried sludge has low moisture content, stable property, no odor, convenient transportation, which provides the basic conditions for sludge resource utilization.

1. Utilization of sludge and building materials

Brick making, cement making and ceramsite making from sludge belong to the utilization of building materials, among which brick making and ceramsite making are the common economic methods at present. Sludge brick can be divided into two categories: 1. The dry sludge after dewatering by sludge drying equipment is directly made into bricks; 2. Brick making with dry sludge incineration ash. What's the difference between the two? When making bricks with dry sludge, attention should be paid to the amount of sludge added. The economic cost of using this method is relatively low. However, if excessive dry sludge is added, it is easy to cause brick cracking and other problems such as brick strength reduction. Therefore, at present, the method of using sludge incineration ash as raw material is often used in brick making.

2. Land use of sludge

Due to the large amount of inorganic matter, nitrogen, phosphorus and other substances in sludge, it can be used as soil amendment and composting. At present, the existing applications mainly include agriculture, landscape, soil remediation and other fields. No, it should be noted that there are also harmful substances such as heavy metal elements and organic pollutants in the sludge. Therefore, the sludge can only be used in the soil after harmless and stable treatment. Otherwise, the possible environmental risks will not be compensated for compared with the economic benefits brought by land use. At present, there have been many successful land use cases in foreign countries. However, due to the low organic content and complex composition of sludge in China, there is still a long way to go in land use.

In addition to the above two, there are other resource utilization methods, which will not be introduced one by one here. In the sludge treatment and disposal, the effect of sludge deep dehydration will also affect the subsequent resource utilization, so it is very important to select a good sludge drying equipment. ZJN environmental protection equipment provides customized design service for users of automatic sludge drying production line. It only takes 1-2 people to complete the drying operation. It is simple to operate and easy to maintain. Friends who need can contact us.